.container{
    margin: 0 auto;
}
@media screen and (max-width:768px){
    .container{
        width:100%;
    }
}
@media screen and (min-width:768px) and (max-width:992px){
    .container{
        width:750px;
    }
}
@media screen and (min-width:992px) and (max-width:1200px){
    .container{
        width:970px;
    }
}
@media screen and (min-width:1200px){
    .container{
        width: 1170px;
    }
}
